Fall back to regular labeling if T shaped labels or flag labels are out of frame

[shoumikchow]

Similar to #3, there can be cases where the label is not drawn/written if the coordinates are outside of the frame. In that case, the label should fallback to the regular label.

[shreyasvedpathak]

Hey, I am working on this too. And it seems to be working fine, I have done some tests on test images. Everything is in a test folder. Should I keep the folder for you to review? I'll make the PR accordingly.

[shreyasvedpathak]

Please check #8